<abstract xmlns="http://www.w3.org/1999/xhtml">

The tetracalcium phosphate/nanomonetite (TTCPMH) biocements with the addition of sodium alginate were prepared by mechanical homogenization of powder mixture with hardening liquid containing sodium alginate. The effect of various viscosity of different alginates on properties of TTCPMH cement mixture was investigated. The medium viscous (MED) alginate had a more negative effect on setting process and compressive strength than low viscous (LOW) alginate. An approx. 50% decrease in mechanical properties (compressive strengths, Young´s modulus, work of fracture (WOF)) was revealed after an addition of 0.25 wt % with rapid fall above 1 wt % of LOW alginate in biocement. A statistically significant difference in the WOF was found between of 0.25 and 0.5 LOW alginate biocements (p&lt;0.035) whereas no statistical differences were revealed between WOF of 0.5 and 1 LOW alginate biocements (p˃0.357). In the microstructure of composite cements, the increased amounts of granular or finer needle-like nanohydroxyapatite particles arranged into the form of more separated spherical agglomerates were observed. A low cytotoxicity of cement extracts based on measurement of cell proliferation was revealed.
</abstract>

Influence of Sodium Alginate on Properties of Tetracalcium Phosphate/Nanomonetite Biocement

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Sintering of Cr-prealloyed PM steels requires atmospheres with good quality – low oxygen potential – to achieve satisfactory sintering results. But during heating even the best atmospheres may be oxidizing, the system turns to reducing conditions only at high temperatures, which can be monitored by thermal analysis. During the dewaxing process, oxidizing conditions are favourable for effective dewaxing without sooting and blistering. However, this may result in some oxygen pickup during heating, and then the final properties of the produced parts may be strongly influenced by this intermediate oxidation. This study demonstrates the behaviour of artificially oxidized steels (Fe-C and Fe3Cr-0.5Mo-C) during the sintering process by stepwise sintering. Iron and steel powder were slightly oxidized and then pressed and sintered at different temperatures. In parallel, as a second approach, pressed samples were oxidized and then sintered. Density, hardness and impact energy were measured and dilatometry/MS was used for online monitoring of the sintering process. The starting oxygen content of 0.20 to 0.30 wt% is high enough to change the sintering behaviour of the materials, but still leads to rather good properties. Thermal analysis showed that most of the oxygen picked up was present as iron oxides on the surface which were reduced by hydrogen at rather low temperatures, confirming that these were iron oxides, which also holds for the Cr-prealloyed variant. The biggest influence on the final performance was exerted by the final carbon content and the microstructural development of the material.
</abstract>

Study on Sintering of Artificially Oxidized Steel Compacts

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The effect of binder content and WC grain size on the mechanical properties is widely investigated in literature. An increase in binder amount and WC grain size leads to a decrease in hardness and an increase in fracture toughness. Actually, these correlations are related to the influence of binder content and WC grain size through the contiguity and mean binder free path, which are the microstructural parameters that affect the mechanical properties. The aim of this study is to verify the dependence of the two microstructural parameters that govern the WCCo mechanical behaviour, namely the contiguity and mean binder free path, on the mechanical properties of an extended range of WC-Co samples, which differ in terms of Co content and tungsten carbide grain size.
</abstract>

T Dependence of the Mechanical Properties on the Microstructural Parameters of WC-Co

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Neodymium niobate NdNbO4 (NNO) and tantalate NdTaO4 (NTO) thin films (~100 nm) were prepared by sol-gel/spin-coating process on Pb(Zr0.52Ti0.48)O3/Al2O3 substrates with annealing at 1000°C. The precursors of films were synthesized using Nb or Ta tartrate complexes. The XRD results of NNO and NTO films confirmed tetragonal T-NdNbO4 and T-NdTaO4 phases, respectively, with traces of monoclinic MNdNbO4 and M´-NdTaO4. The surface morphology and topography were investigated by SEM and AFM analysis. NTO was smoother with roughness 5.24 nm in comparison with NNO (6.95 nm). In the microstructure of NNO, small spherical (~ 20-50 nm) T-NdNbO4 and larger needle-like particles (~100 nm) of M-NdNbO4 phase were observed. The compact clusters composed of fine spherical T-NdTaO4 particles (~ 50 nm) and cuboidal M´-NdTaO4 particles (~ 100 nm) were found in NTO. The results of this work can contribute to formation of different polymorphs of films for the application in environmental electrolytic thin film devices.
</abstract>

Polymorphs of Neodymium Niobate and Tantalate Thin Films Prepared by Sol-Gel Method

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The influence of die wall lubrication during warm die compaction on densification, microstructure and mechanical properties of three low alloy ferrous powders was investigated. Specimens were sintered at 1250°C. Die wall lubrication leads to higher green and sintered density and enhances the dimensional stability. It does not affect the microstructure of the matrix, while pores are smaller and more rounded than in bulk lubricated specimens. In TRS tests, both strength and deformation are higher in die wall lubricated specimens than bulk lubricated ones.
</abstract>

TFM SpA, via del Concilio 3, 35035 Lissaro di Mestrino (PD),

Die Wall - Vs. Bulk Lubrication in Warm Die Compaction: Density, Microstructure and Mechanical Properties of Three Low Alloyed Steels

AHEAD OF PRINT

Volume 22 (2022): Issue 1 (December 2022)

Volume 21 (2021): Issue 2 (December 2021)

Volume 21 (2021): Issue 1 (June 2021)

Volume 20 (2020): Issue 2 (December 2020)

Volume 20 (2020): Issue 1 (June 2020)

Volume 19 (2019): Issue 2 (December 2019)

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Volume 18 (2018): Issue 2 (November 2018)

Volume 18 (2018): Issue 1 (June 2018)

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Powder Metallurgy Progress

 POWDER METALLURGY PROGRESS – international journal of powder technology and powder-derived materials.  POWDER METALLURGY PROGRESS is an international peer-reviewed open-access materials science journal with a more than 20 years long publishing history. Since the establishment in 2001, PMP published a wide variety of quality works, focused mainly on powder metallurgy of metals, the evolution of the technology itself, preparation, properties, and applications of particular materials.  In 2021 after the celebration of the 20th anniversary of the journal, it underwent changes and transformations focused mainly on the publishing interests and scope. Now it is extended to broadly all fields of powder-derived materials and technologies.  Works from the fields of powder metallurgy, metals, alloys, ceramics, and composites, basic and applied research of materials science related to mechanical and functional properties, manufacturing, and characterization are always welcomed.  Actual Scope of the journal:    materials research such as materials physics, materials chemistry, materials engineering, traditional and advanced powder metallurgy, materials processing;  wide range of metal, ceramic and composite materials including metal matrix, ceramic matrix, polymer matrix composites, and hybrid organic-inorganic-metal-ceramic material systems, structural materials, functional materials, biomaterials, porous materials, magnetic electric and multifunctional materials such as magnetic composites, magnetoelectric, magnetocaloric, ferroelectric, piezoelectric, thermoelectric, magneto-optic, magnetostrictive, or high-temperature materials;  advanced as well as traditional production technology and processing, additive manufacturing, 3D printing, Press and Sinter, HIP, MIM, PIM, Spark Plasma Sintering, Hot Pressing, Microwave Sintering, Plasma Treatment, Slip Casting, Rapid Heating, Ultrafast Sintering, new progressive compaction and processing methods;  influence of material processing parameters on their microstructure formation and development and structural relations of physical, mechanical, and functional properties of materials focusing but not limited on powder materials;  special technological processes of PM material with individual-particular-special physical-chemical properties;  environmental issues of production and application of PM materials;  industrial processes, management, and quality, (creation of normative) standard method activity, economical analysis, conception (philosophy) and prediction in PM and progressive material processing field;  production of technological equipment for powder and advanced materials technology.   The owner of the journal: Institute of Materials Research Slovak Academy of Science.  Why subscribe and read  PMP journal is an open-access journal that publishes original theoretical and experimental articles as well as review articles related to all aspects of PM. The journal is peer-reviewed, follows ethical publishing practices, and is searchable, discoverable, and citable.  Why submit  The journal has a distinguished Editorial Board with extensive academic qualifications, ensuring that the journal maintains high scientific standards and has broad international coverage. All manuscripts that are submitted to the PMP journal will NOT BE subject to any Article Processing Charges.  Rejection Rate   16.21 %   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 